LAN9303 datasheet(71/366 Pages) SMSC

71 / 366 page

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Datasheet

SMSC LAN9303/LAN9303i

Revision 1.3 (08-27-09)

DATASHEET

Note: For the last three cases, if the VID is not in the VLAN table, the VLAN is considered foreign

and the membership result is NULL. A NULL membership will result in the packet being filtered

if Enable Membership Checking is set. A NULL membership will also result in the packet being

filtered if the destination address is not found in the ALR table (since the packet would have

no destinations).

6.4.3

Transmit Priority Queue Selection

The transmit priority queue may be selected from five options. As shown in Figure 6.4, the priority may

be based on:

the static value for the destination address in the ALR table

the precedence bits in the IPv4 TOS octet

the DIFFSERV mapping table indexed by the IPv4 TOS octet or the IPv6 Traffic Class octet

the VLAN tag priority field using the per port Priority Regeneration table

the port default

All options are sent through the Traffic Class table which maps the selected priority to one of the four

output queues.

Figure 6.4 Switch Engine Transmit Queue Selection

priority

calculation

programmable

DiffServ table

programmable

port default

table

programmable

Priority

Regeneration

table

per port

static DA

override

Packet is Tagged

VL Higher Priority

Packet is IPv4

Packet is IP

Use Precedence

Use IP

ALR Priority Enable Bit

IPv4(TOS)

IPv6(TC)

DA Highest Priority

priority queue

Source Port

ALR Priority

VLAN Priority

IPv4 Precedence

Use Tag

Packet is from Host

programmable

Traffic Class

table

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